gbemu/src/gameBoy.cpp at 91f78681e7ab2f5776578b57400e778cce34146b · sdslabs/gbemu · GitHub

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#include "types.h"
#include "cpu.h"
#include "gameBoy.h"

int GBE::s_Cycles;

GBE::GBE()
{
	// Initialize the CPU
	gbe_cpu = new CPU();

	// Initialize the MemoryMap
	gbe_mMap = new MemoryMap();

	// Initialize the Graphics
	gbe_graphics = new PPU();

	// audio = new Audio();
	gbe_audio = new APU();

	// Unify the CPU and MemoryMap
	gbe_cpu->setMemory(gbe_mMap);

	// Unify the CPU and PPU
	gbe_cpu->setPPU(gbe_graphics);

	// Unify the PPU and MemoryMap
	gbe_graphics->setMemoryMap(gbe_mMap);
	gbe_graphics->init();

	// Unify the APU and MemoryMap
	gbe_audio->setMemoryMap(gbe_mMap);
	// initialize the write handler
	gbe_audio->initializeWriteHandler();

	// Open the Boot ROM
	if ((bootROM = fopen("../src/dmg_boot.gb", "rb")) == NULL)
		printf("boot rom file not opened\n");

	// // Open the Game ROM
	// if ((gameROM = fopen("../tests/tetris.gb", "rb")) == NULL)
	// 	printf("game rom file not opened");

	// Open the Game ROM
	if ((gameROM = fopen("../tests/dmg_sound/rom_singles/02-len ctr.gb", "rb")) == NULL)
		printf("game rom file not opened\n");

	// Set the Boot ROM
	gbe_mMap->setBootRomFile(bootROM);

	// Set the Game ROM
	gbe_mMap->setRomFile(gameROM);

	// Map to ROMs to mMap
	gbe_mMap->mapRom();

	s_Cycles = 0;

	// Adding the Nintendo Logo to ROM
	// to pass the Boot check

	gbe_mMap->debugWriteMemory(0x104, 0xCE);
	gbe_mMap->debugWriteMemory(0x105, 0xED);
	gbe_mMap->debugWriteMemory(0x106, 0x66);
	gbe_mMap->debugWriteMemory(0x107, 0x66);
	gbe_mMap->debugWriteMemory(0x108, 0xCC);
	gbe_mMap->debugWriteMemory(0x109, 0x0D);
	gbe_mMap->debugWriteMemory(0x10A, 0x00);
	gbe_mMap->debugWriteMemory(0x10B, 0x0B);
	gbe_mMap->debugWriteMemory(0x10C, 0x03);
	gbe_mMap->debugWriteMemory(0x10D, 0x73);
	gbe_mMap->debugWriteMemory(0x10E, 0x00);
	gbe_mMap->debugWriteMemory(0x10F, 0x83);
	gbe_mMap->debugWriteMemory(0x110, 0x00);
	gbe_mMap->debugWriteMemory(0x111, 0x0C);
	gbe_mMap->debugWriteMemory(0x112, 0x00);
	gbe_mMap->debugWriteMemory(0x113, 0x0D);
	gbe_mMap->debugWriteMemory(0x114, 0x00);
	gbe_mMap->debugWriteMemory(0x115, 0x08);
	gbe_mMap->debugWriteMemory(0x116, 0x11);
	gbe_mMap->debugWriteMemory(0x117, 0x1F);
	gbe_mMap->debugWriteMemory(0x118, 0x88);
	gbe_mMap->debugWriteMemory(0x119, 0x89);
	gbe_mMap->debugWriteMemory(0x11A, 0x00);
	gbe_mMap->debugWriteMemory(0x11B, 0x0E);
	gbe_mMap->debugWriteMemory(0x11C, 0xDC);
	gbe_mMap->debugWriteMemory(0x11D, 0xCC);
	gbe_mMap->debugWriteMemory(0x11E, 0x6E);
	gbe_mMap->debugWriteMemory(0x11F, 0xE6);
	gbe_mMap->debugWriteMemory(0x120, 0xDD);
	gbe_mMap->debugWriteMemory(0x121, 0xDD);
	gbe_mMap->debugWriteMemory(0x122, 0xD9);
	gbe_mMap->debugWriteMemory(0x123, 0x99);
	gbe_mMap->debugWriteMemory(0x124, 0xBB);
	gbe_mMap->debugWriteMemory(0x125, 0xBB);
	gbe_mMap->debugWriteMemory(0x126, 0x67);
	gbe_mMap->debugWriteMemory(0x127, 0x63);
	gbe_mMap->debugWriteMemory(0x128, 0x6E);
	gbe_mMap->debugWriteMemory(0x129, 0x0E);
	gbe_mMap->debugWriteMemory(0x12A, 0xEC);
	gbe_mMap->debugWriteMemory(0x12B, 0xCC);
	gbe_mMap->debugWriteMemory(0x12C, 0xDD);
	gbe_mMap->debugWriteMemory(0x12D, 0xDC);
	gbe_mMap->debugWriteMemory(0x12E, 0x99);
	gbe_mMap->debugWriteMemory(0x12F, 0x9F);
	gbe_mMap->debugWriteMemory(0x130, 0xBB);
	gbe_mMap->debugWriteMemory(0x131, 0xB9);
	gbe_mMap->debugWriteMemory(0x132, 0x33);
	gbe_mMap->debugWriteMemory(0x133, 0x3E);

	executeBootROM();
	update();
}

void GBE::update()
{
	// Update function of the GBE
	// Will be called every frame
	// GB has 59.73 frames per second
	while (true)
	{
		// Execute the next instruction
		s_Cycles += gbe_cpu->executeNextInstruction();

		// update the DIV and TIMA timers
		gbe_cpu->updateTimers(s_Cycles);
		gbe_graphics->executePPU(s_Cycles);
		gbe_audio->stepAPU(s_Cycles);
		s_Cycles = 0;
		s_Cycles += gbe_cpu->performInterrupt();
		gbe_graphics->pollEvents();
	}
}

void GBE::executeBootROM()
{
	while (gbe_mMap->readMemory(0xFF50) == 0x00)
	{
		s_Cycles += gbe_cpu->executeNextInstruction();
		gbe_cpu->updateTimers(s_Cycles);
		gbe_graphics->executePPU(s_Cycles);
		s_Cycles = 0;
		s_Cycles += gbe_cpu->performInterrupt();
	}

	gbe_mMap->unloadBootRom();
}